Hideaki Kitazawa

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Formaldehyde is a highly toxic compound to most living organisms. We have isolated a bacterial strain that is able to efficiently degrade formaldehyde and use it as a sole carbon source. The isolated strain was identified as Methylobacterium sp. MF1, which could grow on formaldehyde and methanol. Methylobacterium sp. MF1 was grown in batch culture using 1.2(More)
Radioactive soil particles several tens of micrometers in size were collected from litter soil in the radiation contaminated area by the Fukushima nuclear plant accident and characterized using electron and X-ray microanalyses. The radioactive particles were discriminated by autoradiography using imaging plates (IP) on which microgrids were formed by laser(More)
We report on specific-heat measurements of the heavy-fermion compounds Ce(1 - x)Y(x)PdAl (0 ≤ x ≤ 1) between 0.35 and 300 K and in magnetic fields up to 14 T. Ce(1 - x)Y(x)PdAl compounds crystallize in the hexagonal ZrNiAl-type structure and CePdAl orders antiferromagnetically below T(N) = 2.8 K. The specific heat measured in external magnetic fields is(More)
The temperature dependence of the electronic structure of CeBi arising from two types of antiferromagnetic transitions based on optical conductivity (σ(ω)) was observed. The σ(ω) spectrum continuously and discontinuously changes at 25 and 11 K, respectively. Between these temperatures, two peaks in the spectrum rapidly shift to the opposite energy sides as(More)
A ternary silicide Sr(Ga(0.37),Si(0.63))(2) was synthesized by a floating zone method. Electron diffraction and powder x-ray diffraction measurements indicate that the silicide has the AlB(2)-type structure with the lattice constants of a = 4.1427(6) A and c = 4.7998(9) A, where Si and Ga atoms are arranged in a chemically disordered honeycomb lattice and(More)
YbPdSi with orthorhombic crystal structure (space group Pmmn) exhibits a magnetic transition at [Formula: see text] K, below which a ferromagnetic moment develops with an enhanced electronic specific-heat coefficient [Formula: see text] mJ K(-2) mol(-1). We have investigated the magnetization, electrical resistivity, and specific heat of YbPdSi using single(More)
We have observed the magnetic-phase transitions of CeSb and CeBi by a magnetic circular dichroism spectroscopy in the infrared region. The phase boundary is similar to that detected by neutron scattering. The optical spectra re#ect the electronic structures in the ordered states. The electronic structure and also the origin of the magnetic transition are(More)
Anodic porous alumina with duplex layers exhibits a voltage-induced switching effect and is a promising candidate for resistive random access memory. The nanostructural analysis of porous alumina is important for understanding the switching effect. We investigated the difference between the two layers of an anodic porous alumina film using transmission(More)
Methylobacterium sp. MF1 (an obligate methylotrophic bacterium isolated newly by the authors) and Acidomonas methanolica MB58 (a facultative methylotrophic bacterium) uptake formaldehyde similarly. It was found that the former assimilated formaldehyde via the serine pathway whereas the latter did so via the ribulose-monophosphate pathway from the(More)
The quantitativeness of an evaporative light-scattering detector (ELSD) for supercritical fluid chromatography (SFC) was evaluated by using an equimass mixture of uniform poly(ethylene glycol) (PEG) oligomers. Uniform oligomers, in which all molecules have an identical molecular mass, are useful for the accurate calibration of detectors. We calibrated the(More)